package com.lagou.config;

import com.lagou.io.Resources;
import com.lagou.pojo.Configuration;
import com.mchange.v2.c3p0.ComboPooledDataSource;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

import java.beans.PropertyVetoException;
import java.io.InputStream;
import java.util.List;
import java.util.Properties;

public class XmlConfigBuilder {

    private Configuration configuration;

    public XmlConfigBuilder() {
        this.configuration = new Configuration();
    }

    public Configuration parseConfig(InputStream in) throws DocumentException, PropertyVetoException {
        Document read = new SAXReader().read(in);
        Element rootElement = read.getRootElement();

        /**
         *  SqlMapConfig。xml的解析
         */
        List<Element> list = rootElement.selectNodes("//property");
        Properties properties = new Properties();
        for (Element element : list) {
            String name = element.attributeValue("name");
            String value = element.attributeValue("value");
            properties.setProperty(name,value);
        }
        ComboPooledDataSource dataSource = new ComboPooledDataSource();
        dataSource.setDriverClass(properties.getProperty("driverClass"));
        dataSource.setJdbcUrl(properties.getProperty("jdbcUrl"));
        dataSource.setPassword(properties.getProperty("password"));
        dataSource.setUser(properties.getProperty("username"));
        configuration.setDataSource(dataSource);

        /**
         * mapper.xml的解析 拿到路径------转换成字节输入流---------dom4j进行解析
         */
        List<Element> mapperList = rootElement.selectNodes("//mapper");
        for (Element element : mapperList) {
            String resource = element.attributeValue("resource");
            InputStream resourceAsStream = Resources.getResourceAsStream(resource);
            XMLMapperBuilder xmlMapperBuilder = new XMLMapperBuilder(configuration);
            xmlMapperBuilder.parse(resourceAsStream);
        }
        return  configuration;

    }
}
